基于电波传播机理的虚拟多视角穿墙雷达成像方法研究

Through-The-Wall Radar (TWR) objects imaging is the crucial step of complex environment sensing and understanding which has been widely applied in military, enforcement and civilian tasks. The time-domain ultra-short impulse Ultra-Wideband TWR has the ability of Decorrelating multipath returns, understands thoroughly the mechanism of multipath returns including different views of the same object, researches virtual multiple-views imaging method based on radio propagation model. Firstly, under the radar transmitting signal unknown, combined radio propagation mechnism, sparsity-constrained optimization with layer-stripping method to achieve blind estimation of wall parameters.Secondly, models indoor complex radio propagation mechanism based on rivised Green function. Thirdly, in order to enhance the signal-to-clutter ratio (SCR) of the imaged objects, the project uses indoor radio propagation revised model and multiple-path scattering model, researches the estimation of ghosts location and the design of mapping matrix and mapping strategy. The project will accelerate the development of related topic of public safety of National outline for Medium and Long Terms S&T(2006-2020) and people’s livelihood science and technology of Twelfth Five-Year National Plan for S&T .

穿墙雷达目标成像是室内复杂环境感知的关键，在许多军事、执法等领域得到广泛应用。本项目利用时域超宽带穿墙雷达提供的多径信号去相关能力，深入理解多径分量为目标提供不同观测视角的内在机理，将传统的多径抑制向利用多径提供的虚拟多视角转变，开展基于电波传播机理的虚拟多视角成像方法研究。具体为雷达发射脉冲未知，利用广义反射系数稀疏先验，结合电波传播机理、稀疏优化和逐层反演思想实现墙体参数的盲估计；建立Green函数为核心的室内电波传播修正模型，在此基础上深入理解修正Green函数与波束形成算法的内在联系，研究波束形成图像中幻影定位方法、目标关联矩阵和策略的设计，从而实现利用多径信息增强目标图像的信杂干比。该项目的顺利实施将有助于加速《国家中长期科学和技术发展规划纲要（2006-2020）》中“公共安全领域”和《国家“十二五”科学和技术发展规划纲要》中“大力加强民生科技”相关重点领域研究进展。